单项选择题

A．for
B．to
C．of
D．if
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单项选择题
What was the author’s purpose when writing this passage
A．To give practical instruction for pruning a tree.
B．To give a gardener description of pruning.
C．To explain how trees develop disease.
D．To discuss different methods of pruning.
单项选择题
How many common forms of sugar are exemplified in this passage
A．One.
B．Two.
C．One hundred.
D．Several hundreds.
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